Process of preparing 2,2'-(1-methyl-1,2-ethanediylidene)bis{hydrazine carboximidamide}

摘要

The invention concerns a process for preparing 2,2'-(1-methyl-1,2-ethanediylidene)bisÄhydrazine carboximidamideÜ comprising the steps of : a) reacting aminoguanidine hydrochloride with methylglyoxal aldehyde or methylglyoxal dimethyl acetal in an acidic aqueous reaction medium to produce 2,2'-(1-methyl-1,2-ethanediylidene)bisÄhydrazine carboximidamideÜ; and b) purifying the 2,2'-(1-methyl-1,2-ethanediylidene)bisÄhydrazine carboximidamideÜ by recrystallization from an acidic aqueous medium.